How do we know where the carbon is coming from?
I found the part on Carbon-14 cycle most interesting – given that there was spike in C14 in the 1950s-1960s due to above ground nuclear bomb testing. And then the amount of C13 can tell us where the added CO2 in the atmosphere is coming from:

“We can now distinguish between the three possible sources of added CO2. We can immediately excludes the circulating pool, because the added CO2 contains no 14C. Of the remaining two possible sources, carbon dioxide from fossil fuels will be depleted in 13C relative to a mineral standard, while carbon dioxide from mineral sources will not. So the question is, has atmospheric carbon dioxide become more depleted in 13C over time, as its amount has risen?

Sun. 07.16.17 – Unfortunately, much like everyone’s favorite little Canela the Chihuahua, this blog fell asleep and has been napping since early May.

Life has been a bit too busy. Hopefully, this upcoming week will allow me to catch up somewhat, as I have been collecting links for the Sunday Tidbits for the last two months and they are a bit overflowing now.

Photo of Canela taken by Ms. Jen with her Nikon D800 yesterday afternoon.